<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="js/jquery-3.6.0.js"></script>
</head>
<body>
<input type="button" id="btn" value="发送异步">
</body>
<script>
    $(function(){
        $("#btn").click(function(){
            $.ajax({
                url:"jacksonDemo",
                success:function (obt) {
                    console.log(obt)
                    console.log(obt.u3.name)
                },
                dataType:"json",

            })
        })
    })
</script>
</html>